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A passive delta-sigma ADC with a voltage-controlled-oscillator (VCO) quantizer is presented. By employing the VCO quantizer, a single-bit quantizer is replaced with a multi-bit quantizer while an extra order of noise-shaping was provided. The proposed architecture does not need very large capacitors as compared to the conventional passive delta-sigma ADC. Furthermore, it also does not require external...
A G-band rectangular beam multi-gap Extended Interaction Klystron (EIK) with unequal-length gaps is proposed. The high-frequency features indicates that the designed model has wide frequency intervals with π mode, which has a good uniformity in field distribution with the maximum (R/Q)•M2. The PIC simulation shows a stable output power of 1378 W without oscillation in 218.9 GHz, with the efficiency...
This paper introduces a power and gain optimized programmable gain-bandwidth amplifier as sensor interface of physiological signals for batteryless applications. The proposed interface is divided in two independent stages that use capacitive networks to set the gain and bandwidth. The first stage is a tunable bandwidth frontend amplifier (TB-FEA), which operates from 10 Hz to 3.5 kHz, for processing...
We present performance characterization of a bio-potential recording system with an asynchronous readout architecture. The signal processing chain consists of a low-noise bio-potential amplifier, spike detection circuitry, and an address event representation (AER) communication protocol. The system was fabricated in a 0.5 pm CMOS technology. Each stage of the recording system was tested individually,...
In this paper, a wide-band circularly polarized (CP) crossed dipole antenna is proposed. The CP crossed dipole antenna is backed by a cavity reflector to achieve wide-band CP radiation with enhanced gain and uni-directional pattern accompanied by high front to back lobe ratio. A comprehensive study on the effect of the vertical walls of the cavity reflector on the CP radiation performance has been...
This paper introduces a new antenna model designed to be applied to V2V communications. This antenna can be integrated easily into the automobiles infrastructure and was designed for VANET networks [1] based on LTE technology and IEEE 802.11p standard [2]. The design of this model is based on operating frequencies of these two technologies. In the design process, it was prioritized that each operating...
This paper presents a new stacked-Yagi antenna operating in the E-band that uses logarithmic spiral elements to achieve an ultra wideband response and circular polarization. An SIW structure is used to excite the spiral structure as the single element and a matching post is used as a balun. This element is then used in a vertical stacked-Yagi configuration in order to increase the antenna gain. According...
Regardless of the bandwidth of reflectarray (RA) elements, the RA bandwidth is narrower for many possible reasons. For a RA with small f/D, the ray path length varies as we move away from the center, which is compensated by the elements that are designed at the center frequency. However, as the frequency changes, the path length phase errors grows, as we move away from the center, at a more rapid...
Microstrip patch antenna finds a better choice in wireless communications because of their less cost, light weight and ease of fabrication. This paper proposes a novel design for the bandwidth enhancement of microstrip patch antenna with parasitic patch placed adjacent to the radiating patch along with the slots. The proposed structure is designed at 8.5 GHz using FR4-epoxy as substrate material that...
A two-stage low-noise amplifier (LNA), designed using GlobalFoundries' 130 nm SiGe BiCMOS process technology for 56–64 GHz applications is presented in this paper. The LNA consists of two cascode stages, with inductive degeneration using short stub transmission lines with a quarter wavelength. The input matching and output matching adopt T-section matching to ensure optimal noise and input matching,...
This paper presents the design of the small size broadband patch antenna for L-band applications. The size reduction is obtaining without changing frequency thanks to etched six slots in antenna ground plane. The comparison between the conventional and the designed antennas demonstrates that the etched slots in the ground plane increases the bandwidth by a factor of 2.3 and reduces the antenna size...
This paper presents a dipole antenna as a feed of extended hemispherical lens for 60 GHz applications. This structure employs lens structure for gain enhancement and a dipole antenna as a beam launcher. Electromagnetic simulations of the proposed structure, including optimization of the extended lens length, are performed by CST. Throughout this paper, the design process of the proposed 60 GHz antenna...
This paper investigates the radiation characteristics of on-chip microstrip patch reflectarray for 60 GHz system. The proposed reflectarray is fed using on-chip cylindrical dielectric resonator antenna, CDRA placed at a distance 42.5 mm from the array aperture. The antenna introduces good impedance matching at 61 GHz. The impedance bandwidth is 1.35 GHz. The reflectarray consists of 289 unit-cell...
This paper proposes a high-gain mechanically reconfigurable antenna array based on a ring-shaped slotted-waveguide antenna for mm-wave applications. A full scanning range in the azimuthal plane is ensured by proper mechanically rotating a metallic jacket, which partially covers the array radiating structure. The technique provides a beamwidth of 37° in the azimuth plane and gain of 17.41 dBi at the...
The deployment of smart grid communication networks (SGCN) in urban areas has been possible due to the huge availability of wired and wireless communication technologies. However, in rural areas, those communications options are usually not available, unsuitable and/or too costly, making the deployment of a SGCN more challenging in such a case. On the other hand, the recently introduced low power...
In this paper, a dual segment rectangular dielectric resonator antenna (RDRA) designed on an MgO-B2O3-SiO2-TiO2 (MBST) glass-ceramic LTCC substrate is described. The simulation results for the RDRA on MBST substrate is compared with those for RDRA on FR4 substrate. Another section of the simulation study includes the effect of composite substrates i.e. FR4-air (FR4C) and MBST-air (MBSTC) substrates...
We present a robust adaptive digital pre-distortion technique to mitigate the linear and non-linear degradation of optical communication transmitter components. The proposed method is based on the principles of memory polynomial based pre-distortion and indirect learning architecture. Effectiveness of the presented algorithm is assessed across various higher order modulation formats and higher baud...
This paper presents a time-interleaved continuous time Sigma-Delta converter, which uses 4 identical channels clocked at equally shifted time moments of a 4 GHz clock. The data in each channel is filtered and afterwards recombined in a multiplexer, leading to an output signal at 4 GHz before decimation. Time-interleaving as proposed in this paper makes it possible to increase the signal-to-noise and...
This paper presents the novel concept of the fully differential operational floating conveyor (FD-OFC) for the first time, to the best of the authors knowledge. A CMOS design for the proposed FD-OFC is introduced as an 8 (4x4) port general purpose analog building block. The proposed design has the advantage of low power consumption as it can operate under biasing conditions of only 1.5 V, while its...
In this paper, a novel ultra-low power, programmable gain instrumentation amplifier (PG-IA) for biomedical signal processing applications is presented. The fully differential PG-IA employs a new rail-to-rail current mirror input pair with three stage indirect compensation (RR-CMI) amplifier. The proposed design improves the dc offset by implementing a fully symmetrical structure and is further reduced...
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